胰腺癌早期症状隐匿，缺乏特异性，易被忽视，患者就诊时多为进展期，手术切除率特别是根治性手术切除率较低，远期疗效不佳。近20年来，尽管新的影像诊断技术及综合治疗手段不断问世，给许多恶性肿瘤的治疗开创了崭新的局面，但却未从根本上改变胰腺癌诊治的窘境。胰腺癌总体疗效较差，但早期病例根治术后仍可使其生存率明显延长。据美国对1989～1995年1340家医院的100313例胰腺癌的统计，Ⅰ期胰腺癌的5年生存率为32.8%。日本的全国统计资料显示，Ⅰ期胰腺导管癌的术后5年生存率达61%。可见，提高胰腺癌远期疗效的关键仍在于早期诊断。目前，影像学检查是胰腺癌最常用的检查手段，对影像学检查呈现出一些细微变化而难以定性的患者，下述方法可成为早期诊断的佐证。
近年胰腺癌的发病率明显增加，过去10年，美国及欧洲的发病率已达到8/10万～12/10万，我国与其相近似。胰腺癌的治疗效果至今却难以令人满意，5年生存率无显著提高。主要的原因是由于胰腺的位置深在，胰腺癌又缺乏特异性的临床表现，早期诊断非常困难，大多数患者到医院就诊时已属于Ⅱ、Ⅲ、Ⅳ期肿瘤。治愈的唯一可能性是肿瘤的外科切除，但根治性手术切除率仅为18.6%，5年生存率在0～24%。未治疗者中位生存期为6～8个月。目前，随着影像学技术、内窥镜和腹腔镜超声等多项检查手段的应用与普及，对胰腺癌能否切除可以做出较准确的术前评估，这对合理地选择治疗方法，提高手术切除率，避免不必要的“开腹探查”有着重要的意义。
Objective To explore the effect on apoptotic genes of pancreatic adenocarcinoma cell BxPC-3 from subcutaneous transplantation tumor in nude mice induced by 5-FU and sulfasalazine (SZ).Methods Changes of apoptosis-related genes 〔bcl-2, cyclinD1, Bax and NF-κB (p65)〕 in subcutaneous transplantation tumor treated by 5-FU, SZ alone or both at the levels of mRNA and protein were measured by RT-PCR and Western blot. Results NF-κB (p65) at mRNA relative content and protein expression in subcutaneously heterotopic transplantation tumor treated by 5-FU (7.5, 15 mg/kg), SZ (10, 20 mg/kg) alone or both showed significant difference, except for two subsets in SZ group, respectively, in comparison with each control group (P＜0.01). Meanwhile bcl-2 and cyclinD1 at the levels of mRNA and protein, and Bax protein level were significantly different from each control group (P＜0.01). The above-mentioned indexes were show obvious interaction of both by multiple factor analysis of variance. Conclusion Up-regulated level of Bax, down-regulated levels of bcl-2, cyclinD1 and NF-κB (p65) might be one of apoptotic mechanisms that SZ synergistically enhanced apoptotic effect on pancreatic adenocarcinoma cell BxPC-3 of subcutaneous transplantation tumor in nude mice induced by 5-FU.
【 Abstract 】 Objective Overexpressions of epidermal growth factor (EGF) and EGF receptor have been associated with progression and invasive phenotype of pancreatic cancer. However, the underlying molecular mechanism by which EGF worked in pancreatic cancer cells has not been completely understood. In this study, effect of EGF on the invasion and metastasis of pancreatic cancer cells and its regulatory mechanism were investigated. Methods The effects of EGF on the proliferation, adhesion and invasion of pancreatic cancer cells were detected by WST-1 proliferation assay, adhesion assay and invasive assay, respectively. The activity and expression of MMP-2 and MMP-9 were examined by zymography, Western blot and RT-PCR, respectively. The activity of NF- κ B was examined by EMSA. Results EGF could significantly promote the invasiveness of pancreatic cancer cells but did not affect cell proliferation or adhesion. The expressions of NF- κ B and MMP-9 were significantly increased by EGF, but EGF did not affect the activity and expression of MMP-2. Furthermore, EGF stimulated the NF- κ B binding activity. Pretreatment with NF- κ B inhibitors, pyrrolidine dithiocarbamate (PDTC), could significantly inhibit the activity of NF- κ B induced by EGF. Meanwhile, the EGF-induced expression and activity of MMP-9, as well as cell invasiveness were also inhibited by NF- κ B inhibitor. Conclusion EGF could increase the expression and promote the invasiveness of MMP-9 via the activation of NF- κ B in pancreatic cancer cells, which implies that NF- κ B inhibitant, such as PDTC, may diminish the invasiveness of pancreatic cancer cells.
【Abstract】 Objective To explore the features of Ki-ras mutations at codon 12 in Chinese patients of pancreatic cancer and to compare these features with those in Western countries. Methods Fifty-nine samples were collected during operations for pancreatic adenocarcinoma in our hospital from December 1989 to November 1997. The patients, age ranged from 30 to 73 years 〔(55.5±10.4) years〕,with 38 males and 21 female. TNM staging of the patients: stage Ⅰ(n=4); stage Ⅱ(n=8), stage Ⅲ(n=42),stage Ⅳ(n=5). PCR was used to amplify target gene and Dot blot hybridization for detecting Ki-ras mutations at codon 12 was performed in fifty-nine specimens of Chinese pancreatic cancer. The data of Ki-ras mutations at codon 12 from Western countries were gotten by Medline system. Results Ki-ras mutation at codon 12 was detected in 76.3% of the patients in this group. The frequency of double mutation of Ki-ras at codon 12 in this group (15.6%) was highest than that in western countries. Our results were compared with those reported in Western countries. The results suggested that there were the significant differences in the substitution of Ki-ras mutations at codon 12 and in the ratio of transition to transversion in pancreatic cancer among various countries. Conclusion Ki-ras mutations at codon 12 is frequent in Chinese pancreatic cancer, and a gene component to pancreatic cancer may be different among various countries. In addition, the effect of Ki-ras mutations at codon 12 on prognosis of patients with pancreatic cancer is different in various countries.
【Abstract】ObjectiveTo evaluate the relationships between the transporters BSEP， MRP2， MDR3 and cholesterol calculus formation. MethodsTwenty hepatic tissue specimens were taken from consented patients with cholesterol calculus during intraoperative liver biopsy, of which ten were taken from patients without cholesterol calculus. RNA of liver tissue from all the samples was extracted and ultraviolet spectrophotometry was used to measure the content and purity of it. The mRNA and protein expressions of BSEP, MRP2 and MDR3 were determined by reverse transcriptionpolymerase chain reaction (RTPCR) and Western blot analysis, respectively. ResultsRTPCR showed that the mRNA expressions of BSEP, MRP2 and MDR3 in liver were significantly lower in patients with cholesterol calculus （0.47±0.18, 1.12±0.39 and 1.02±0.24） than those in the liver of patients without calculus （0.90±0.42, 2.48±0.89 and 1.94±0.80）,P＜0.01. And Western blot also showed the protein expressions of these transporters were significantly lower in patients with cholesterol calculus （90.16±18.82, 45.43±22.77 and 61.08±14.77） than those in the liver of patients without calculus (186.17±4.34, 160.47±30.19 and 100.84±15.44). ConclusionThe decreased expression of BSEP, MRP2 and MDR3 may correlate with the formation of cholesterol calculus.